What term is used to describe the most distal phalanx of the manus of a Tyrannosaurus?

Question

BlackTom AI · Accepted Answer

Ungual — the specialized terminal phalanx that supports a claw, nail, or hoof.

Relevant knowledge points: In tetrapod limb anatomy the manus (hand) is composed of carpals (wrist bones), metacarpals (palm bones), and phalanges (finger bones). Phalanges are named by position along each digit: proximal (closest to the wrist), intermediate/middle (if present), and distal (the most terminal). The distal-most phalanx that typically anchors a claw or nail is called the ungual or ungual phalanx (also referred to as the terminal phalanx).

Step-by-step reasoning:
1. Identify the bone asked for: “the most distal phalanx of the manus” — this is the terminal phalanx at the tip of a digit.
2. Apply anatomical terminology: The terminal/distal phalanx in animals that bear claws or nails is termed the ungual (from Latin unguis = nail).
3. In theropod dinosaurs such as Tyrannosaurus, the distal phalanges of the fingers commonly supported keratinous sheaths forming claws; paleontologists therefore describe those bones as unguals or ungual phalanges.

No numeric calculations are required; the logical chain is anatomical definition → identification of the terminal phalanx → naming as “ungual.”

Why the correct answer is correct: “Ungual” is the standard anatomical/paleontological term for the distal phalanx that bears a claw or nail. In descriptions and figures of Tyrannosaurus manus anatomy, the terminal phalanges are labeled as unguals.

Why other possible terms would be incorrect: “Metacarpal” refers to the palm bones, not the distal tip. “Carpal” refers to wrist bones. Generic “phalanx” could mean any phalangeal bone and does not specify the distal/terminal element. “Claw” or “nail” describes the keratinous covering, not the bone itself; the bone is the ungual.

Conclusion: The most distal phalanx of the manus of a Tyrannosaurus is correctly called the ungual, matching the provided answer.

What term is used to describe the most distal phalanx of the manus of a Tyrannosaurus?单项选择题

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